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| For the past 2-3 yrs, I've had a huge attack on my shrubs by these things, in the late fall. I was wondering what I can do NOW to prevent a recurrence this yr. Last yr I picked off by hand, probably 1,000 or more! |
Follow-Up Postings:
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| Interesting. I had to look this one up. Odd that it seems to be only found in North Carolina Tennessee and Massachusetts. This would make one think that it were an introduced pest, but there is very little information on this insect that I can find. I am going to as my bug people at the university about it, next time I see them. Anyway Spinosad controls other Sawfly larvae and should control this one also. Oil at 2% is useful in the fall to smother eggs, assuming they are laying eggs on the host plant as do most sawfly. BT. will not work on sawfly, a lot of people try this assuming they are caterpillars. You may get more help in the Pests and diseases forum. |
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| Oh, I made an assumption that the common name Sawfly wasp was Tenthredo grandis, it is the only insect I found with this common name. But fool be me if it is not, which is why we should not use them. |
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| I've had them here in West Virginia on red twig dogwood, and also some other plants. |
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| There are thousands of species of sawflies. Many of them a pretty species specific as to their host plant. I assume that julescap is referring to the (dreaded) dogwood sawfly, but we should verify that. Advice in another forum suggested that our original poster call his/her extension office to find out when these sawflies are laying eggs in that specific location. It will be sometime in the spring. At that time (or shortly thereafter), Neem oil would be a very good option for control and is typically recommended. After the eggs hatch, and the insects are still very small, applications of insecticidal soap are recommended. But you will have to be observant and look carefully for the little larvae. Remember, they hatch from a very small egg and eat to grow. Timing is essential. |
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- Posted by marilynhall z5 NY (My Page) on Fri, Jun 29, 12 at 11:22
| I'm in New York in the Hudson Valley. I had a red twig dogwood covered by these critters one year -- devoured every leaf on the bush. I used horticultural oil the next year, but lost the battle. I decided to remove the plant, for fear it would infect other types of dogwood in my yard -- and because it seemed like too much work to keep this one shrub attractive! I never saw them again. |
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